Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f49ee18b689616…

MALICIOUS

PDF

73.5 KB Created: 2021-01-11 11:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 163ea354c74e29fac1e7bab416de93da SHA-1: 14c474330a888b76a126e32e2b656216a7745c8b SHA-256: 99f49ee18b689616b4eb7f7ede4bdb384e25baf3759b1f4fce1befe160b0b3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text related to Spanish words and mentions wkhtmltopdf, hinting at its origin and potential use in generating deceptive content to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=describing+words+that+start+with+r+in+spanish PDF link annotation
    • https://cdn.sqhk.co/rajunakeb/bZogijj/34813084077.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/b828ac2d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/tidemazujipozilip.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/kilog.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/xogewafaburaxidezudom.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/dnd_3.5_boots_of_the_winterlands.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/awesome_screenshot_safari.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/3293615413.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/62876799317.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/cambiar_contrasea_spotify_desde_android.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/gugetufiwusitiwamipibuf.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/owens_corning_fiberglass_pipe_insulation_submittal_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/xasiraduxuxukixub.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/zoligegez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5536 bytes
SHA-256: 56fbe2189b9e81ce2aac06eedb5f8316570016c0a95c5f24d1ad114397364ecc
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10932 bytes
SHA-256: 5b44b683166acd3b9e566e263846c44fb0e557d4f69cf4ffb55288d7e6f0c9d1

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